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"Quicken cannot open the data file because it is in use by some other application. Please close that application and try again."

I am trying to use a file which was emailed to me.  The file was created in Quicken 2010 Deluxe and I am running Quicken 2011 Home & Business.  What is preventing me from opening the file?
  • I get the same after creating a backup or validating a quicken file.  Q 2013 Premier.  This after updating to Release 9.
  • .
After saving the attachment to your local hard drive, close and restart Windows to see if that helps.  Your email program may have still have some ties to it.
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